A kinetic study of the formation of a model high-valent diiron non-heme complex, [FeIIIFeIV(μ-O)2(tpa)2]3+ (tpa = tris(2-pyridylmethyl)amine), by cryogenic stopped-flow techniques †

Abstract

[Fe2(µ-O)(tpa)2(OH)(H2O)]3+ reacts with H2O2 in acetonitrile at –40 °C forming a transient diferric peroxo intermediate (λmax = 700 nm, e = 1800 dm3 mol–1 cm–1), which then reacts with a second H2O2 molecule to give [FeIIIFeIV(µ-O)2(tpa)2]3+.